Thickening self-invertible inverse latex comprising, as an inverting agent, surfactant species of the polyglycerol ester family, and compositions containing same

ABSTRACT

Disclosed is a self-invertible inverse latex including, as an inverting agent, surfactant species of the polyglycerol ester family; the use thereof as a thickening and/or emulsifying and/or stabilising agent for a cosmetic, dermopharmaceutical or pharmaceutical topical composition, and cosmetic, dermopharmaceutical or pharmaceutical topical compositions containing same. Also disclosed is a new surfactant composition containing polyglycerol esters.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the U.S. national phase of International ApplicationNo. PCT/FR2019/050443 filed Feb. 27, 2019 which designated the U.S. andclaims priority to French Application No. 1851933 filed Mar. 6, 2018,the entire contents of each of which are hereby incorporated byreference.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to self-invertible inverse latexes comprising, asinverting agent, a surfactant composition comprising esters ofpolyglycerols and glycerol and/or glycerol oligomers, to the use of saidself-invertible inverse latexes as thickeners used to prepare cosmeticor pharmaceutical formulations for topical use, as well as to saidformulations thus prepared.

Description of the Related Art

Cosmetic and pharmaceutical compositions for topical use, comprisingpolar phases, such as, for example, aqueous, alcoholic,aqueous/alcoholic or aqueous/glycolic phases, frequently require the useof rheology-modifying polymers to increase the viscosity of said polarphases, and more generally to confer on them a specific rheologicalbehavior. Rheology modifiers provide both an increase in the viscosityof the polar phase, as well as a degree of consistency of and/or astabilizing effect on the composition for topical use to be thickened.

The rheology-modifying agents which can be used for the preparation ofthese compositions for topical use include synthetic polymers, such as,for example, anionic or cationic or ampholytic polyelectrolytes, whichare linear or branched and crosslinked or noncrosslinked, exist in twophysical forms, the powder form and the liquid form.

Said cosmetic and pharmaceutical compositions for topical use aregenerally provided in the form of aqueous gels, of aqueous/alcoholicgels, of aqueous/glycolic gels, of emulsions or of microemulsions or ofnanoemulsions of water-in-oil type or of oil-in-water type or ofwater-in-oil-in-water type or of oil-in-water-in-oil type.

The anionic or cationic or ampholytic polyelectrolytes, which are linearor branched and crosslinked or noncrosslinked, provided in a liquidform, include those known under the name of “self-invertible inverselatexes”, which are emulsions of water-in-oil type comprising thepolyelectrolyte, an aqueous phase, a fatty phase composed of at leastone oil, at least one emulsifier of water-in-oil type and at least oneemulsifier of oil-in-water type. In processes for the preparation ofself-invertible inverse latexes by the use of an inverse emulsionradical polymerization, the surfactants of oil-in-water type are addedon conclusion of the polymerization stage. The purpose of their additionis to modify and to adjust the hydrophilic/lipophilic balance of thewater-in-oil emulsion comprising the polymer (also known as “inverselatex”) so as to obtain a mixture which, once added to a polar phase,such as, for example, water, will change emulsion direction in order topass from the water-in-oil form to the oil-in-water form, then making itpossible to bring the polymer prepared previously into contact with thepolar phase to be thickened. During such a physical phenomenon, thepolymer of crosslinked and/or branched polyelectrolyte type spreads outin said polar phase and forms a three-dimensional network making itpossible for the polar phase to swell, which is manifested by anincrease in the viscosity of this polar phase. The mixture comprisingthe “inverse latex” and the surfactant of oil-in-water type is known asself-invertible inverse latex and said surfactant of oil-in-water typeis known as “inverter” or “inverting agent”.

The inverting agents commonly used for the preparation ofself-invertible inverse latexes are surface-active agents ofoil-in-water type which have an HLB (hydrophilic/lipophilic balance)value which is sufficiently high to make it possible to prepare stableemulsions of oil-in-water type, generally of greater than 9 and lessthan 16. They generally comprise a hydrophilic part consisting of asequence of ethylene oxide units and a part consisting of an aliphatichydrocarbon chain of hydrophobic nature. These inverting agents include:

-   -   ethoxylated fatty alcohols, the aliphatic hydrocarbon chain of        which comprises from 8 to 14 carbon atoms and the number of        ethylene oxide units of which is between 5 and 40, for example        ethoxylated lauryl alcohol comprising 7 mol of ethylene oxide        (INCI name: Laureth-7) or tridecyl alcohol comprising 6 mol of        ethylene oxide (INCI name: Trideceth-6);    -   ethoxylated sorbitan esters, the aliphatic hydrocarbon chain of        which comprises from 12 to 22 carbon atoms and the number of        ethylene oxide units of which is between 5 and 40, for example        ethoxylated sorbitan oleate comprising 20 mol of ethylene oxide,        sold under the trade name Montanox™ 80, or ethoxylated sorbitan        laurate comprising 20 mol of ethylene oxide, sold under the        trade name Montanox™ 20;    -   ethoxylated alkylphenols, for example ethoxylated nonylphenols        and ethoxylated octylphenols; or    -   ethoxylated castor oils, for example ethoxylated castor oil        comprising 40 mol of ethylene oxide, sold under the brand name        Simulsol™ OL 50.

Changes in consumer demands and in regulatory provisions have ledcosmetic composition formulators to reduce the proportion of ingredientscomprising ethylene oxide units in their formulations. There thus existsa need to prepare self-invertible inverse latexes which are devoid ofethoxylated surfactants as inverting agents.

The French patent applications published under the numbers 2 794 034, 2794 124, 2 808 447, 2 808 446 and 2 810 883 describe the use of alkylpolyglycosides, the hydrocarbon alkyl chain of which comprises from 1 to30 carbon atoms, as inverting agents for preparing self-invertibleinverse latexes, such as, for example, mixtures of alkyl polyglucosides,the hydrocarbon alkyl chains of which are decyl, dodecyl and tetradecylchains, such as the mixture sold under the brand name Simulsol™ SL 10,dodecyl, tetradecyl and hexadecyl chains, such as the mixture sold underthe name brand Simulsol™ SL 26, octyl and decyl chains, such as themixture sold under the brand name Simulsol™ SL 8, or the undecylenylchain, such as the mixture sold under the brand name Simulsol™ SL 11W.

However, the use of such compounds for preparing self-invertible inverselatexes has to be carried out at a temperature greater than theirmelting point, generally greater than 70° C., which poses problems ofincrease in the viscosity of the inverse latex and results in a degreeof destabilization of said self-invertible inverse latex prepared. Insome cases, it is carried out by prediluting said alkyl polyglycosidesin water in order to have available a liquid form which can be handledat ambient temperature. This sometimes has the consequence of reducingthe rate of inversion of said self-invertible inverse latexes in thepolar phases to be thickened, and thus of reducing the productivity ofprocesses for the preparation of cosmetic formulations comprising suchthickening agents.

The international application published under the number WO 2009/156691discloses the use of polyglycerol esters as inverting agents forpreparing self-invertible inverse latexes, for example decaglycerolesters, such as decaglycerol monolaurate, decaglycerol oleate,decaglycerol monocaprylate or decaglycerol monomyristate. However, theiruse leads to self-invertible inverse latexes for which the rate ofinversion in the polar phases to be thickened is too slow and evendecreases when the self-invertible inverse latex is stored after itspreparation for more than one month of preparation.

SUMMARY OF THE INVENTION

The inventors have thus sought to develop a novel inverting surfactantsystem of oil-in-water type, compatible with the environmental standardsin force, being in particular devoid of alkylene oxide units, which makeit possible to prepare self-invertible inverse latexes:

-   -   which can be usable easily and in particular which can be pumped        at 25° C., which have a viscosity of less than or equal to 8000        mPa·s, preferably of less than or equal to 5000 mPa·s, which        viscosity is measured at 25° C. using a Brookfield RVT        viscometer and the No. 3 spindle at a speed of 20        revolutions/minute,    -   which exhibit a smooth appearance, and are devoid of grains or        lumps, and    -   which have good inversion properties in polar phases, that is to        say inducing a fast and reliable inversion speed.

A subject matter of the invention is thus a self-invertible inverselatex of a crosslinked anionic polyelectrolyte (P) comprising, per 100mol %:

(a₁)—of a proportion of greater than or equal to 30 mol % and less thanor equal to 100 mol % of monomer units resulting from2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid in free acidor partially or totally salified form;

(a₂)—optionally of a proportion of greater than 0 mol % and less than orequal to 70 mol % of monomer units resulting from at least one monomerchosen from the elements of the group consisting of acrylic acid,methacrylic acid, 2-(carboxyethyl)acrylic acid, itaconic acid, maleicacid and 3-methyl-3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylfunctional group of said monomers being in the free acid, partiallysalified or completely salified form, and/or from the elements of thegroup consisting of 2-hydroxyethyl acrylate, 2,3-dihydroxypropylacrylate, 2-hydroxyethyl methacrylate, 2,3-dihydroxypropyl methacrylate,or vinylpyrrolidone;

(a₃)—of a proportion of greater than 0 mol % and less than or equal to 1mol % of monomer units resulting from at least one diethylenic orpolyethylenic crosslinking monomer (AR);

the sum of said molar proportions of monomer units according to a₁), a₂)and a₃) being equal to 100 mol %;

said self-invertible inverse latex being an emulsion of water-in-oiltype (W) comprising, per 100% of its weight:

a)—from 10% by weight to 90% by weight of said crosslinked anionicpolyelectrolyte (P);

b)—from 5% by weight to 50% by weight of a fatty phase constituted of atleast one oil (O);

c)—from 1% by weight to 50% by weight of water;

d)—from 0.5% by weight to 10% by weight of an emulsifying system ofwater-in-oil type (S₁); and

e)—from 2% by weight to 10% by weight of an emulsifying system ofoil-in-water type (S₂);

the sum of the proportions by weight of compounds according to a), b),c), d) and e) being equal to 100% by weight;

-   said self-invertible inverse latex being characterized in that said    emulsifying system of oil-in-water type (S₂) comprises, per 100% of    its weight:

f)—a proportion of greater than or equal to 50% by weight and less thanor equal to 100% of a composition (C_(e)) which comprises, per 100% ofits weight:

-   -   e₁)—from 10% by weight to 60% by weight, more particularly from        15% by weight to 60% by weight and very particularly from 15% by        weight to 50% of at least one compound of formula (I):        HO—[CH₂—CH(OH)—CH₂—O]_(n)—H  (I)        in which n represents an integer greater than or equal to 1 and        less than or equal to 15;    -   e₂)—from 40% by weight to 90% by weight, more particularly from        40% by weight to 85% by weight and very particularly from 50% by        weight to 85% by weight of at least one compound of formula        (II):        R₁—(C═O)—[O—CH₂—CH(OH)—CH₂]_(p)—OH  (II),        in which p, which is different from or identical to n,        represents an integer greater than or equal to 1 and less than        or equal to 15; and in which the R₁—(C═O)— group represents a        saturated or unsaturated and linear or branched aliphatic        radical comprising from 6 to 22 carbon atoms; and optionally    -   e₃)—up to 30% by weight, more particularly from 0% by weight to        25% by weight and very particularly from 0% by weight to 20% by        weight of at least one composition (C₁₁) represented by the        formula (III):        HO—[CH₂—CHOH—CH₂—O—]_(q)-(G)_(r)-H  (III),        in which q, which is different from or identical to n,        represents an integer greater than or equal to 1 and less than        or equal to 3, G represents the residue of a reducing sugar and        r represents a decimal number greater than or equal to 1.05 and        less than or equal to 5.00;    -   said composition (C₁₁) consisting of a mixture of the compounds        of formulae (III₁), (III₂), (III₃), (III₄) and (III₅):        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₁-H  (III₁),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₂-H  (III₂),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₃-H  (III₃),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₄-H  (III₄),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₅-H  (III₅),        in molar proportions of said compounds of formulae (III₁),        (III₂), (III₃), (III₄) and (III₅) respectively equal to a₁, a₂,        a₃, a₄ and a₅, such that the sum (a₁+a₂+a₃+a₄+a₅) is equal to 1,        and that the sum (a₁+2a₂+3a₃+4a₄+5a₅) is equal to r;    -   the sum of the proportions by weight of compounds according to        e₁), e₂) and e₃) being equal to 100% by weight.

Within the meaning of the present invention, crosslinked anionicpolyelectrolyte (P) denotes, for the polymer (P), a nonlinearpolyelectrolyte which is provided in the form of a three-dimensionalnetwork which is insoluble in water but which can swell in water andwhich then results in a chemical gel being obtained.

Within the meaning of the present invention, the term “salified”indicates that the acid functional group present in a monomer is in ananionic form associated in the salt form with a cation, in particularalkali metal salts, such as sodium or potassium cations, or such asnitrogenous base cations, such as the ammonium salt, the lysine salt orthe monoethanolamine (HOCH₂—CH₂—NH₄ ⁺) salt. They are preferably sodiumor ammonium salts.

According to a particular aspect of the present invention, saidself-invertible inverse latex as defined above comprises from 20% byweight to 90% by weight, and more particularly from 30% by weight to 90%by weight, more particularly from 30% by weight to 80% by weight, andmore particularly still from 33% by weight to 80% by weight of saidcrosslinked anionic polyelectrolyte (P).

According to another particular aspect of the present invention, themolar proportion of monomer units resulting from2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid in free acidor partially or completely salified form present in said crosslinkedanionic polyelectrolyte (P) is greater than or equal to 32 mol % andless than or equal to 100 mol %, more particularly greater than or equalto 40 mol % and less than or equal to 100 mol %.

According to a particular aspect of the present invention, the2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid is in thesodium or ammonium salt form.

According to another particular aspect of the present invention, saidcrosslinked anionic polyelectrolyte (P) results from the polymerization,per 100 mol %:

(a₁)—of a proportion of greater than or equal to 32 mol % and less than100 mol %, more particularly of greater than or equal to 40 mol % andless than or equal to 100 mol %, of monomer units resulting from amonomer possessing a strong acid functional group, which is partiallysalified or completely salified, more particularly of a sodium salt oran ammonium salt of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid; and

(a₂)—of a proportion of greater than 0 mol % and less than or equal to68 mol %, more particularly of greater than 0 mol % and less than orequal to 60 mol %, of monomer units resulting from at least one monomerchosen from the elements of the group consisting of acrylic acid,methacrylic acid, 2-(carboxyethyl)acrylic acid, itaconic acid, maleicacid and 3-methyl-3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylfunctional group of said monomers being in the acid, partially salifiedor completely salified form, and/or from the elements of the groupconsisting of 2-hydroxyethyl acrylate, 2,3-dihydroxypropyl acrylate,2-hydroxyethyl methacrylate, 2,3-dihydroxypropyl methacrylate andvinylpyrrolidone; and

(a₃)—of a proportion of greater than 0 mol % and less than or equal to 1mol % of monomer units resulting from at least one diethylenic orpolyethylenic crosslinking monomer (AR); it being understood that thesum of the molar proportions of the monomer units (a₁), (a₂) and (a₃) isequal to 100%.

At least one diethylenic or polyethylenic crosslinking monomer (AR)denotes, in the definition of said crosslinked anionic polyelectrolyte(P), in particular a monomer chosen from methylenebis(acrylamide),ethylene glycol dimethacrylate, diethylene glycol diacrylate, ethyleneglycol diacrylate, diallylurea, triallylamine, trimethylolpropanetriacrylate or methylenebis(acrylamide) or a mixture of these compounds,diallyoxyacetic acid or one of its salts, such as sodiumdiallyloxyacetate, or a mixture of these compounds; and moreparticularly a monomer chosen from ethylene glycol dimethacrylate,triallylamine, trimethylolpropane triacrylate ormethylenebis(acrylamide) or a mixture of these compounds.

According to another particular aspect, said crosslinking monomer (AR)is used in a molar proportion of less than or equal to 0.5%, moreparticularly of less than or equal to 0.25% and very particularly ofless than or equal to 0.1%; it is more particularly greater than orequal to 0.005 mol %.

According to another particular aspect of the present invention, saidcrosslinked anionic polyelectrolyte (P) is a homopolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially orcompletely salified in the sodium salt or ammonium salt form,crosslinked by triallylamine and/or methylenebis(acrylamide); acopolymer of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acidand of acrylic acid which are partially or completely salified in thesodium salt or ammonium salt form, crosslinked by triallylamine and/ormethylenebis(acrylamide); a copolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid (γ)partially or completely salified in the sodium salt form and of acrylicacid (δ) partially or completely salified in the sodium salt form in amolar ratio (γ)/(δ) of greater than or equal to 30/70 and less than orequal to 90/10, crosslinked by triallylamine and/ormethylenebis(acrylamide); or a copolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid (γ)partially or completely salified in the sodium salt form and of acrylicacid (δ) partially or completely salified in the sodium salt form in amolar ratio (γ)/(δ) of greater than or equal to 40/60 and less than orequal to 90/10, crosslinked by triallylamine and/ormethylenebis(acrylamide).

Oil (O) denotes, in the definition of said self-invertible inverselatex, in particular:

-   -   linear alkanes comprising from 11 to 19 carbon atoms;    -   branched alkanes comprising from 7 to 40 carbon atoms, such as        isododecane, isopentadecane, isohexadecane, isoheptadecane,        isooctadecane, isononadecane or isoeicosane, or mixtures of some        of them, such as those mentioned below and identified by their        INCI name: C₇₋₈ isoparaffin, C₈₋₉ isoparaffin, C₉₋₁₁        isoparaffin, C₉₋₁₂ isoparaffin, C₉₋₁₃ isoparaffin, C₉₋₁₄        isoparaffin, C₉₋₁₆ isoparaffin, C₁₀₋₁₁ isoparaffin, C₁₀₋₁₂        isoparaffin, C₁₀₋₁₃ isoparaffin, C₁₁₋₁₂ isoparaffin, C₁₁₋₁₃        isoparaffin, C₁₁₋₁₄ isoparaffin, C₁₂₋₁₄ isoparaffin, C₁₂₋₂₀        isoparaffin, C₁₃₋₁₄ isoparaffin, C₁₃₋₁₆ isoparaffin;    -   cycloalkanes optionally substituted by one or more linear or        branched alkyl radicals;    -   white mineral oils, such as those sold under the following        names: Marcol™ 52, Marcol™ 82, Drakeol™ 6VR, Eolane™ 130 or        Eolane™ 150;    -   hemisqualane (or 2,6,10-trimethyldodecane; CAS number:        3891-98-3), squalane (or 2,6,10,15,19,23-hexamethyltetracosane),        hydrogenated polyisobutene or hydrogenated polydecene;    -   mixtures of alkanes comprising from 15 to 19 carbon atoms, said        alkanes being linear alkanes, branched alkanes and cycloalkanes,        and more particularly the mixture (M₁) which comprises, per 100%        of its weight, a proportion by weight of branched alkanes of        greater than or equal to 90% and less than or equal to 100%; a        proportion by weight of linear alkanes of greater than or equal        to 0% and less than or equal to 9%, and more particularly less        than 5%, and a proportion by weight of cycloalkanes of greater        than or equal to 0% and less than or equal to 1%, for example        the mixtures sold under the name Emogreen™ L15 or Emogreen™ L19;    -   the fatty alcohol ethers of formula (IV):        Z₁—O—Z₂  (IV),        in which Z₁ and Z₂, which are identical or different, represent        a linear or branched alkyl radical comprising from 5 to 18        carbon atoms, for example dioctyl ether, didecyl ether,        didodecyl ether, dodecyl octyl ether, dihexadecyl ether,        1,3-dimethylbutyl tetradecyl ether, 1,3-dimethylbutyl hexadecyl        ether, bis(1,3-dimethylbutyl) ether or dihexyl ether;    -   monoesters of fatty acids and of alcohols of formula (V):        R′₁—(C═O)—O—R′₂  (V),        in which R′₁—(C═O) represents a saturated or unsaturated and        linear or branched acyl radical comprising from 8 to 24 carbon        atoms and R′₂ represents, independently of R′₁, a saturated or        unsaturated and linear or branched hydrocarbon chain comprising        from 1 to 24 carbon atoms, for example methyl laurate, ethyl        laurate, propyl laurate, isopropyl laurate, butyl laurate,        2-butyl laurate, hexyl laurate, methyl cocoate, ethyl cocoate,        propyl cocoate, isopropyl cocoate, butyl cocoate, 2-butyl        cocoate, hexyl cocoate, methyl myristate, ethyl myristate,        propyl myristate, isopropyl myristate, butyl myristate, 2-butyl        myristate, hexyl myristate, octyl myristate, methyl palmitate,        ethyl palmitate, propyl palmitate, isopropyl palmitate, butyl        palmitate, 2-butyl palmitate, hexyl palmitate, octyl palmitate,        methyl oleate, ethyl oleate, propyl oleate, isopropyl oleate,        butyl oleate, 2-butyl oleate, hexyl oleate, octyl oleate, methyl        stearate, ethyl stearate, propyl stearate, isopropyl stearate,        butyl stearate, 2-butyl stearate, hexyl stearate, octyl        stearate, methyl isostearate, ethyl isostearate, propyl        isostearate, isopropyl isostearate, butyl isostearate, 2-butyl        isostearate, hexyl isostearate or isostearyl isostearate;    -   diesters of fatty acids and of glycerol of formula (VI) and of        formula (VII):        R′₃—(C═O)—O—CH₂—CH(OH)—CH₂—O—(C═O)—R′₄  (VI)        R′₅—(C═O)—O—CH₂—CH[O—(C═O)—R′₆]—CH₂—OH  (VII),        in which formulae (VI) and (VII) R′₃—(C═O), R′₄—(C═O), R′₅—(C═O)        and R′₆—(C═O), which are identical or different, represent a        saturated or unsaturated and linear or branched acyl group        comprising from 8 to 24 carbon atoms;    -   triesters of fatty acids and of glycerol of formula (VIII):        R′₇—(C═O)—O—CH₂—CH[O—(C═O)—R″₈]—CH₂—O—(C═O)—R″₉  (VIII),        in which R′₇—(C═O), R′₈—(C═O) and R′₉—(C═O), which are identical        or different, represent a saturated or unsaturated and linear or        branched acyl group comprising from 8 to 24 carbon atoms.

According to another particular aspect of the present invention, saidoil (O) is chosen from undecane, tridecane, isododecane orisohexadecane, mixtures of alkanes and isoalkanes and cycloalkanes, suchas the mixture (M₁) as defined above and the mixtures sold under thename Emogreen™ L15, Emogreen™ L19, Emosmart™ L15, Emosmart™ L19,Emosmart™ V21, Isopar™ L or Isopar™ M; the white mineral oils sold underthe name Marcol™ 52, Marcol™ 82, Drakeol™ 6VR, Eolane™ 130 or Eolane™150; hemisqualane, squalane, hydrogenated polyisobutene or hydrogenatedpolydecene; dioctyl ether or didecyl ether; isopropyl myristate, hexylpalmitate, octyl palmitate, isostearyl isostearate, octanoyl/decanoyltriglyceride, hexadecanoyl/octadecanoyl triglyceride or thetriglycerides resulting from rapeseed oil, sunflower oil, linseed oil orpalm oil.

In said self-invertible inverse latex which is a subject matter of thepresent invention, the emulsifying system (S₁) of water-in-oil typeconsists either of a single emulsifying surfactant or of a mixture ofemulsifying surfactants, provided that said resulting emulsifying system(S₁) has a sufficiently low HLB value to bring about the formation ofemulsions of water-in-oil type.

There are, as emulsifying surfactant of water-in-oil type, for example,esters of anhydrohexitol and of linear or branched and saturated orunsaturated aliphatic carboxylic acids comprising from 12 to 22 carbonatoms, optionally substituted with one or more hydroxyl groups, and moreparticularly esters of anhydrohexitols chosen from anhydrosorbitols andanhydromannitols and of linear or branched and saturated or unsaturatedaliphatic carboxylic acids comprising from 12 to 22 carbon atoms,optionally substituted with one or more hydroxyl groups.

According to another particular aspect of the present invention, saidemulsifying system (S₁) of water-in-oil type is chosen from the elementsof the group consisting of sorbitan laurate, for example that sold underthe name Montane™ 20, sorbitan palmitate, for example that sold underthe name Montane™ 40, sorbitan stearate, for example that sold under thename Montane™ 60, sorbitan oleate, for example that sold under the nameMontane™ 80, sorbitan sesquioleate, for example that sold under the nameMontane™ 85, sorbitan trioleate, for example that sold under the nameMontane™ 83, sorbitan isolaurate, sorbitan isostearate, for example thatsold under the name Montane™ 70, mannitan laurate, mannitan oleate and amixture of these esters; polyesters with a molecular weight of between1000 and 3000 and resulting from the condensation between apolyisobutenyl succinic acid or its anhydride, such as Hypermer™ 2296,or the mixture sold under the brand name Simaline™ IE 501 A, thepolyhydroxystearates of polyglycols of formula (IX):

in which formula (IX) y₂ represents an integer greater than or equal to2 and less than or equal to 50, Z₄ represents a hydrogen atom, a methylradical or an ethyl radical, and Z₃ represents a radical of formula (X):

in which formula (X) y′₂ represents an integer greater than or equal to0 and less than or equal to 10, more particularly greater than or equalto 1 and less than or equal to 10, and Z′₃ represents a radical offormula (X) as defined above, with Z′₃ being identical to or differentfrom Z₃, or a hydrogen atom.

There is, as example of emulsifying surfactant of water-in-oil type offormula (IX) which can be used to prepare the emulsifying system (S₁),PEG-30 dipolyhydroxystearate sold under the name Simaline™ WO, or elsethe mixtures comprising PEG-30 dipolyhydroxystearate and sold under thenames Simaline™ IE 201 A and Simaline™ IE 201 B, or also the mixturecomprising trimethylolpropane-30 tripolyhydroxystearate sold under thename Simaline™ IE 301 B.

In said self-invertible inverse latex which is a subject matter of thepresent invention, the emulsifying system (S₂) of oil-in-water typeconsists either of the composition (C_(e)) alone or of a mixture of saidcomposition (C_(e)) with one or more other emulsifying surfactants,provided that said resulting emulsifying system (S₂) has a sufficientlyhigh HLB value to bring about the formation of emulsions of oil-in-watertype.

According to another more particular aspect of the present invention,said self-invertible inverse latex as defined above is characterized inthat, in the formula (I), n represents an integer greater than or equalto 1 and less than or equal to 10, and in that, in the formula (II), p,which is identical to or different from n, represents an integer greaterthan or equal to 1 and less than or equal to 10, and the R₁—(C═O)— groupis chosen from octanoyl, decanoyl, ω-undecylenoyl, dodecanoyl,tetradecanoyl, hexadecanoyl, octadecanoyl, 9-octadecenoyl or9,12-octadecadienoyl radicals.

According to another even more particular aspect of the presentinvention, in said formulae (I) and (II) as defined above, n is equal to10, p is equal to 10 and the R₁—(C═O)— group is the dodecanoyl radical;n is equal to 6, p is equal to 10 and the R₁—(C═O)— group is thedodecanoyl radical; n is equal to 6, p is equal to 6 and the R₁—(C═O)—group is the dodecanoyl radical or n is equal to 1, p is equal to 10 andthe R₁—(C═O)— group is the dodecanoyl radical.

According to another more particular aspect of the present invention,said self-invertible inverse latex as defined above is characterized inthat, in said emulsifying system of oil-in-water type (S₂), saidcomposition (C_(e)) as defined above consists of, per 100% of itsweight:

-   -   e₁)—from 10% by weight to 60% by weight of at least one compound        of formula (I) as defined above and    -   e₂)—from 40% by weight to 90% by weight of at least one compound        of formula (II) as defined above.

Reducing sugar denotes, in the formula (III) as defined above, thesaccharide derivatives which do not exhibit, in their structures, aglycoside bond established between an anomeric carbon and the oxygen ofan acetal group as defined in the reference publication: “Biochemistry”,Daniel Voet/Judith G. Voet, p. 250, John Wiley & Sons, 1990. Theoligomeric structure (G)_(x) can exist in all forms of isomerisms,whether it is optical isomerism, geometrical isomerism or positionalisomerism; it can also represent a mixture of isomers.

According to another more particular aspect of the present invention, inthe composition (C_(e)) as defined above, G represents, in the formula(III) as defined above, the residue of a reducing sugar chosen from theresidues of glucose, dextrose, sucrose, fructose, idose, gulose,galactose, maltose, isomaltose, maltotriose, lactose, cellobiose,mannose, ribose, xylose, arabinose, lyxose, allose, altrose, dextran ortallose. Said residue G represents more particularly still, in theformula (III) as defined above, a reducing sugar chosen from theresidues of glucose, xylose and arabinose.

The formula (III):HO—CH₂—(CHOH)_(q)—CH₂—O-(G)_(r)-H,representing the composition (C₁₁), means that this composition (C₁) iscomposed essentially of a mixture of compounds represented by theformulae (III₁), (III₂), (III₃), (III₄) and (III₅):HO—CH₂—(CHOH)_(q)—CH₂—O-(G)₁-H  (III₁),HO—CH₂—(CHOH)_(q)—CH₂—O-(G)₂-H  (III₂),HO—CH₂—(CHOH)_(q)—CH₂—O-(G)₃-H  (III₃),HO—CH₂—(CHOH)_(q)—CH₂—O-(G)₄-H  (III₄),HO—CH₂—(CHOH)_(q)—CH₂—O-(G)₅-H  (III₅),in the respective molar proportions a₁, a₂, a₃, a₄ and a₅, such that:

-   the sum a₁+a₂+a₃+a₄+a₅ is equal to 1, and that-   the sum a₁+2a₂+3a₃+4a₄+5a₅ is equal to r.

In the preceding definition, essentially indicates that the presence ofone or more compounds of formula (III_(w)) with w greater than 5 is notexcluded within the composition (C₁₁) but that, if it is present, thenit is present in minimal proportions which do not result in anysubstantial modification to the properties of said composition (C₁₁). Inthe formula (III) as defined above, the HO—CH₂—(CHOH)_(q)—CH₂—O— groupis bonded to (G)_(r) via the anomeric carbon of the saccharide residue,so as to form an acetal functional group.

According to a more particular aspect of the present invention, in theformula (III) representing the composition (C₁₁) as defined above, rrepresents a decimal number greater than or equal to 1.05 and less thanor equal to 3, more particularly greater than or equal to 1.15 and lessthan or equal to 2.5.

According to a more particular aspect of the present invention, saidself-invertible inverse latex as defined above is characterized in that,in the formula (III) as defined above, q is equal to 1, G represents theresidue of glucose and r represents a decimal number greater than orequal to 1.05 and less than or equal to 2.5.

According to another particular aspect of the present invention, saidself-invertible inverse latex as defined above is characterized in that,in said emulsifying system of oil-in-water type (S₂), said composition(C_(e)) as defined above consists of, per 100% of its weight:

-   -   e₁)—from 5% by weight to 15% by weight of at least one compound        of formula (I) as defined above,    -   e₂)—from 60% by weight to 80% by weight of at least one compound        of formula (II) as defined above, and    -   e₃)—from 5% to 15% by weight of at least one composition (C₁₁)        represented by the formula (III) as defined above.

According to another particular aspect of the present invention, saidemulsifying system (S₂) of oil-in-water type comprises, per 100% of itsweight, at least 75% by weight of said composition (C_(e)) as definedabove.

According to a very particular aspect, said inverse latex as definedabove is characterized in that said emulsifying system of oil-in-watertype (S₂) is said composition (C_(e)) as defined above.

Said self-invertible inverse latex which is a subject matter of thepresent invention is prepared by the implementation of an “inverseemulsion polymerization” process, well known to a person skilled in theart, and which comprises the following stages:

-   -   a stage a) of preparation of an aqueous phase comprising water,        water-soluble monomers and optionally the crosslinking monomer        (AR), and also commonly used additives, such as, for example,        sequestering agents, such as ethylenediaminetetraacetic acid        (EDTA) in its sodium salt form, or the pentasodium salt of        diethylenetriaminepentaacetic acid (sold under the brand name        Versenex™ 80);    -   a stage b) of mixing the oily phase (O) with the emulsifying        system of water-in-oil type (S₁);    -   a stage c) of mixing the aqueous phase and the oily phase,        prepared during the preceding stages, and of emulsification        using a stirrer of rotor-stator type;    -   a stage d) of rendering inert with nitrogen;    -   a stage e) of initiation of the polymerization reaction by        introduction, into the emulsion formed in c), of a free radical        initiator and optionally of a coinitiator; then the reaction is        allowed to take place,    -   a stage f) of introduction of the emulsifying system (S₂) of        oil-in-water type as defined above at a temperature of less than        or equal to 50° C.

According to a particular aspect of the process as defined above, thepolymerization reaction of stage e) is initiated by a redox pair whichgenerates hydrogen sulfite (HSO₃ ⁻) ions, such as the cumenehydroperoxide/sodium metabisulfite (Na₂S₂O₅) pair or the cumenehydroperoxide/thionyl chloride (SOCl₂) pair, at a temperature of lessthan or equal to 10° C., accompanied, if desired, by a polymerizationcoinitiator, such as, for example, azobis(isobutyronitrile), and is thencarried out either quasi-adiabatically, up to a temperature of greaterthan or equal to 50° C., or by controlling the temperature.

According to another particular aspect of the process as defined above,the reaction medium resulting from stage e) is concentrated bydistillation, before carrying out stage f).

According to another particular aspect of the process as defined above,the reaction medium resulting from stage e) or from stage f) undergoes astage of drying by atomization in a suitable installation.

According to another particular aspect of the process as defined above,the aqueous phase prepared in stage a) can comprise chain-reducingagents, intended to reduce the length of the polymer chains formed andto increase the degree of branching on the polymer, so as to modify therheological properties.

The chain-reducing agents suitable for the process as defined aboveinclude methanol, isopropanol, butylene glycol, 2-mercaptoethanol,thioglycolic acid, formic acid or its salts.

Another subject matter of the invention is a composition (C_(e)) whichcomprises, per 100% of its weight:

-   -   e₁)—from 10% by weight to 60% by weight, more particularly from        15% by weight to 60% by weight and more particularly still from        15% by weight to 50% by weight of at least one compound of        formula (I):        HO—[CH₂—CH(OH)—CH₂—O]_(n)—H  (I)        in which n represents an integer greater than or equal to 1 and        less than or equal to 15;    -   e₂)—from 40% by weight to 90% by weight, more particularly from        40% by weight to 85% by weight and more particularly still from        50% by weight to 85% by weight of at least one compound of        formula (II):        R₁—(C═O)—[O—CH₂—CH(OH)—CH₂]_(p)—OH  (II),        in which p, which is different from or identical to n,        represents an integer greater than or equal to 1 and less than        or equal to 15; and the R₁—(C═O)— group represents a saturated        or unsaturated and linear or branched aliphatic radical        comprising from 6 to 22 carbon atoms; and optionally    -   e₃)—up to 30% by weight 0% by weight to 30% by weight, more        particularly from 0% by weight to 25% by weight and more        particularly from 0% by weight to 20% by weight of at least one        composition (C₁₁) represented by the formula (III):        HO—[CH₂—CHOH—CH₂—O—]_(q)-(G)_(r)-H  (III),        in which formula (III) q, which is different from or identical        to n, represents an integer greater than or equal to 1 and less        than or equal to 3, G represents the residue of a reducing sugar        and r represents a decimal number greater than or equal to 1.05        and less than or equal to 5.00, said composition (C₁₁)        consisting of a mixture of the compounds of formulae (III₁),        (III₂), (III₃), (III₄) and (III₅):        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₁-H  (III₁),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₂-H  (III₂),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₃-H  (III₃),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₄-H  (III₄),        HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₅-H  (III₅),        in molar proportions of said compounds of formulae (III₁),        (III₂), (III₃), (III₄) and (III₅) respectively equal to a₁, a₂,        a₃, a₄ and a₅, such that the sum a₁+a₂+a₃+a₄+a₅ is equal to 1,        and that the sum a₁+2a₂+3a₃+4a₄+5a₅ is equal to r;

-   the sum of the proportions by weight of compounds according to e₁),    e₂) and e₃) being equal to 100% by weight.

According to a particular aspect, the composition (C_(e)) as definedabove is characterized in that, in the formula (I), n represents aninteger greater than or equal to 1 and less than or equal to 10 and, informula (II), p, which is different from n, represents an integergreater than or equal to 1 and less than or equal to 10.

According to this particular aspect, the composition (C_(e)) as definedabove is more particularly characterized in that, in the formula (I) asdefined above, n is equal to 1 or to 6 and, in the formula (II), p isequal to 6 or to 10.

According to this particular aspect, the composition (C_(e)) as definedabove is also characterized in that, in the formulae (I) and (II) asdefined above, n and p are identical and each represent an integergreater than or equal to 1 and less than or equal to 10 and inparticular greater than or equal to 4 and less than or equal to 8.

According to this particular aspect, the composition (C_(e)) as definedabove is more particularly characterized in that, in the formulae (I)and (II) as defined, n and p are equal to 6.

According to another particular aspect of the present invention, in theformula (II) as defined above, the R₁—(C═O)— group is chosen from theelements of the group consisting of the octanoyl, decanoyl,ω-undecylenoyl, dodecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl,9-octadecenoyl and 9,12-octadecadienoyl radicals; it is moreparticularly the dodecanoyl radical.

A subject matter of the invention is also particularly the composition(C_(e)) as defined above, characterized in that it consists of, per 100%of its weight:

-   -   e₁)—from 10% by weight to 60% by weight of at least one compound        of formula (I) as defined above and    -   e₂)—from 40% by weight to 90% by weight of at least one compound        of formula (II) as defined above.

A subject matter of the invention is also particularly the composition(C_(e)) as defined above, characterized in that, in the formula (III) asdefined above, q is equal to 1, G represents the residue of glucose andr represents a decimal number greater than or equal to 1.05 and lessthan or equal to 2.5.

According to another particular aspect of the present invention, thecomposition (C_(e)) as defined above is characterized in that itconsists of, per 100% of its weight:

-   -   e₁)—from 5% by weight to 15% by weight of at least one compound        of formula (I) as defined above,    -   e₂)—from 60% by weight to 80% by weight of at least one compound        of formula (II) as defined above, and    -   e₃)—from 5% to 15% by weight of at least one composition (C₁₁)        represented by the formula (III) as defined above.

Reducing sugar denotes, in the formula (III), the saccharide derivativesas defined above and G represents, in the formula (III) as definedabove, the residue of a reducing sugar chosen from the residues ofglucose, dextrose, sucrose, fructose, idose, gulose, galactose, maltose,isomaltose, maltotriose, lactose, cellobiose, mannose, ribose, xylose,arabinose, lyxose, allose, altrose, dextran or tallose, and moreparticularly from the residues of glucose, xylose and arabinose.

The formula (III) representing the composition (C₁₁) consists of amixture of compounds represented by the formulae (III₁), (III₂), (III₃),(III₄) and (III₅) as defined above. According to a more particularaspect of the present invention, in the formula (III) representing thecomposition (C₁₁) as defined above, r represents a decimal numbergreater than or equal to 1.05 and less than or equal to 3, moreparticularly greater than or equal to 1.15 and less than or equal to2.5.

According to a more particular aspect, a subject matter of the inventionis a composition (C_(e)) as defined above, for which, in the formula(III), q is equal to 1, G represents the residue of glucose and rrepresents a decimal number greater than or equal to 1.05 and less thanor equal to 2.5.

According to another particular aspect, a subject matter of theinvention is a composition (C_(e)) as defined above, for which, in theformula (I), n represents an integer greater than or equal to 1 and lessthan or equal to 10, in the formula (II), p, which is identical to ordifferent from n, represents an integer greater than or equal to 1 andless than or equal to 10 and the R₁—(C═O)— group is chosen from theoctanoyl, decanoyl, ω-undecylenoyl, dodecanoyl, tetradecanoyl,hexadecanoyl, octadecanoyl, 9-octadecenoyl or 9,12-octadecadienoylradicals, and, in the formula (III), q is equal to 1, G represents theresidue of glucose and r represents a decimal number greater than orequal to 1.05 and less than or equal to 2.5.

According to a very particular aspect, a subject matter of the inventionis a composition (C_(e)) as defined above, for which, in the formula(I), n is equal to 1, in the formula (II), p is equal to 10 and theR₁—(C═O)— group is the dodecanoyl radical and, in the formula (III), qis equal to 1, G represents the residue of glucose and r represents adecimal number greater than or equal to 1.05 and less than or equal to2.5.

The composition (C₁₁) optionally comprised in the composition (C_(e)) isprepared according to a process comprising the following stages:

-   -   a stage A) of reaction, in the desired proportions, of a        reducing sugar of formula (XI) or a mixture of reducing sugars        of formula (XI):        HO-G-H  (XI)        in which G represents the residue of a reducing sugar, with a        molar excess of a compound of formula (XII) or of a mixture of        compounds of formula (XII):        HO—[CH₂—CHOH—CH₂—O—]_(q)H  (XII),        for which formula (XII) q is as defined above for the formula        (III), in order to form a mixture of compounds of formula (III)        as defined above and an excess of said compound of formula        (XII).

Stage A) of the process as defined above can be supplemented, ifnecessary or if desired, by subsequent operations of neutralization, forexample with sodium hydroxide or potassium hydroxide, and/or offiltration, and/or of decoloration, and/or of removal of the residualpolyol, for example by selective extraction by means of a suitablesolvent medium.

Stage A) is generally carried out in a reactor in the presence of anacidic catalytic system, by controlling the stoichiometric ratio betweenthe two reagents, and more particularly by introducing a molar excess ofthe mixture of alcohols of formula (II), with mechanical stirring underpredetermined temperature and partial vacuum conditions, for example ata temperature of between 70° C. and 130° C. and under a partial vacuumof between 300 mbar (3.10⁴ Pa) and 20 mbar (2.10³ Pa). Acidic catalyticsystem denotes strong acids, such as sulfuric acid, hydrochloric acid,phosphoric acid, nitric acid, hypophosphorous acid, methanesulfonicacid, para-toluenesulfonic acid or trifluoromethanesulfonic acid, orion-exchange resins.

Another subject matter of the invention is the use of saidself-invertible inverse latex as defined above as thickening and/oremulsifying and/or stabilizing agent for a topical cosmetic orpharmaceutical composition.

According to another particular aspect, said use consists in stabilizingan emulsion of oil-in-water type or of water-in-oil type, conferring ahomogeneous appearance on said emulsion during storage under variousconditions and more particularly at 25° C. for a time at least equal toone month, and more particularly at 4° C. for a time at least equal toone month, and more particularly at 45° C. for a time at least equal toone month.

According to another particular aspect, said use consists in stabilizingsolid particles in topical cosmetic, dermopharmaceutical orpharmaceutical compositions. These solid particles to be suspended canassume various regular or irregular geometries, and can be provided inthe form of beads, balls, rods, flakes, strips or polyhedra. These solidparticles are characterized by a mean apparent diameter of between 1micrometer and 5 millimeters, more particularly between 10 micrometersand 1 millimeter.

The solid particles which can be suspended and stabilized by theself-invertible inverse latex as defined above in topical cosmetic,dermopharmaceutical or pharmaceutical compositions include micas, ironoxide, titanium oxide, zinc oxide, aluminum oxide, talc, silica, kaolin,clays, boron nitride, calcium carbonate, magnesium carbonate, magnesiumhydrogencarbonate, inorganic colored pigments, polyamides, such asNylon-6, polyethylenes, polypropylenes, polystyrenes, polyesters,acrylic or methacrylic polymers, such as polymethyl methacrylates,polytetrafluoroethylene, crystalline or microcrystalline waxes, porousspheres, selenium sulfide, zinc pyrithione, starches, alginates, plantfibers, loofah particles and sponge particles.

Another subject matter of the invention is a topical cosmeticcomposition (F) or a topical pharmaceutical composition (G),characterized in that it comprises, as thickening agent, per 100% of itstotal weight, between 0.1% and 10% by weight of said self-invertibleinverse latex as defined above.

The expression “topical” used in the definitions of said compositions(F) and (G) means that they are employed by application to the skin, thehair, the scalp or the mucous membranes, whether it is a directapplication, in the case of a cosmetic, dermocosmetic,dermopharmaceutical or pharmaceutical preparation, or an indirectapplication, for example in the case of a body care product in the formof a textile or paper wipe or of sanitary products intended to be incontact with the skin or the mucous membranes.

Said compositions (F) and (G) are generally provided in the form of anaqueous or aqueous/alcoholic or aqueous/glycolic solution, in the formof a suspension, of an emulsion, of a microemulsion or of ananoemulsion, whether they are of water-in-oil, oil-in-water,water-in-oil-in-water or oil-in-water-in-oil type.

Said compositions (F) and (G) can be packaged in a bottle, in a deviceof “pump-action spray” type, in pressurized form in an aerosol device,in a device equipped with a perforated wall, such as a grill, or in adevice equipped with a ball applicator (known as a “roll-on”).

In general, said compositions (F) and (G) also comprise excipientsand/or active principles habitually employed in the field offormulations for topical use, in particular cosmetic, dermocosmetic,pharmaceutical or dermopharmaceutical formulations, such as thickeningand/or gelling surfactants, stabilizers, film-forming compounds,hydrotropic agents, plasticizing agents, emulsifying and coemulsifyingagents, opacifying agents, pearlescent agents, superfatting agents,sequestering agents, chelating agents, antioxidants, fragrances,preservatives, conditioning agents, whitening agents intended forbleaching body hairs and the skin, active principles intended tocontribute a treating action with regard to the skin or hair,sunscreens, pigments or inorganic fillers, particles providing a visualeffect or intended for the encapsulation of active principles,exfoliating particles or texturing agents.

Examples of foaming and/or detergent surfactants which can be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) include anionic, cationic, amphoteric ornonionic foaming and/or detergent surfactants.

Examples of anionic foaming and/or detergent surfactants which can becombined with said self-invertible inverse latex as defined above insaid compositions (F) and (G) include alkali metal, alkaline earthmetal, ammonium, amine or aminoalcohol salts of alkyl ether sulfates, ofalkyl sulfates, of alkylamido ether sulfates, of alkylaryl polyethersulfates, of monoglyceride sulfates, of α-olefinsulfonates, ofparaffinsulfonates, of alkyl phosphates, of alkyl ether phosphates, ofalkylsulfonates, of alkylamidesulfonates, of alkylarylsulfonates, ofalkylcarboxylates, of alkyl sulfosuccinates, of alkyl ethersulfosuccinates, of alkylamide sulfosuccinates, of alkyl sulfoacetates,of alkylsarcosinates, of acylisethionates, of N-acyltaurates, of acyllactylates, of N-acylated derivatives of amino acids, of N-acylatedderivatives of peptides, of N-acylated derivatives of proteins or ofN-acylated derivatives of fatty acids.

The foaming and/or detergent amphoteric surfactants which can becombined with said self-invertible inverse latex as defined above insaid compositions (F) and (G) include alkyl betaines, alkyl amidobetaines, sultaines, alkyl amidoalkyl sulfobetaines, imidazolinederivatives, phosphobetaines, amphopolyacetates and amphopropionates.

The foaming and/or detergent cationic surfactants which can be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) particularly include quaternary ammoniumderivatives.

The foaming and/or detergent nonionic surfactants which can be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) more particularly include alkyl polyglycosidescomprising a linear or branched and saturated or unsaturated aliphaticradical and comprising from 8 to 16 carbon atoms, such as octylpolyglucoside, decyl polyglucoside, undecylenyl polyglucoside, dodecylpolyglucoside, tetradecyl polyglucoside, hexadecyl polyglucoside or1,12-dodecanediyl polyglucoside; ethoxylated hydrogenated castor oilderivatives, such as the product sold under the INCI name “PEG-40hydrogenated castor oil”; polysorbates, such as Polysorbate 20,Polysorbate 40, Polysorbate 60, Polysorbate 70, Polysorbate 80 orPolysorbate 85; coconut amides; or N-alkylamines.

Examples of thickening and/or gelling surfactants which can be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) include optionally alkoxylated alkylpolyglycoside fatty esters, such as ethoxylated methyl polyglucosideesters, for example the PEG 120 methyl glucose trioleate and the PEG 120methyl glucose dioleate sold respectively under the names Glucamate™ LTand Glucamate™ DOE120; alkoxylated fatty esters, such as the PEG 150pentaerythrityl tetrastearate sold under the name Crothix™ DS53 or thePEG 55 propylene glycol oleate sold under the name Antil™ 141;fatty-chain polyalkylene glycol carbamates, such as the PPG-14 laurethisophoryl dicarbamate sold under the name Elfacos™ T211 or the PPG-14palmeth-60 hexyl dicarbamate sold under the name Elfacos™ GT2125.

Examples of thickening and/or gelling agents which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include copolymers of AMPS and of alkyl acrylates, thecarbon chain of which comprises between 4 and 30 carbon atoms and moreparticularly between 10 and 30 carbon atoms, linear, branched orcrosslinked terpolymers of at least one monomer carrying a free,partially salified or completely salified strong acid functional groupwith at least one neutral monomer and at least one monomer of formula(XIII):CH₂═C(R′₃)—C(═O)—[CH₂—CH₂—O]_(n′)—R′₄  (XIII)in which R′₃ represents a hydrogen atom or a methyl radical, R′₄represents a linear or branched alkyl radical comprising from 8 to 30carbon atoms and n′ represents a number greater than or equal to 1 andless than or equal to 50.

Examples of thickening and/or gelling agents which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include polysaccharides consisting solely ofmonosaccharides, such as glucans or glucose homopolymers,glucomannoglucans, xyloglycans, galactomannans, the degree ofsubstitution (DS) of the D-galactose units on the main D-mannose chainof which is between 0 and 1 and more particularly between 1 and 0.25,such as galactomannans originating from cassia gum (DS=⅕), locust beangum (DS=¼), tara gum (DS=⅓), guar gum (DS=½) or fenugreek gum (DS=1).

Examples of thickening and/or gelling agents which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include polysaccharides consisting of monosaccharidederivatives, such as sulfated galactans and more particularlycarrageenans and agar, uronans and more particularly algins, alginatesand pectins, heteropolymers of monosaccharides and of uronic acids andmore particularly xanthan gum, gellan gum, gum arabic exudates andkaraya gum exudates, or glucosaminoglycans.

Examples of thickening and/or gelling agents which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include cellulose, cellulose derivatives, such as methylcellulose, ethyl cellulose or hydroxypropyl cellulose, silicates,starch, hydrophilic starch derivatives or polyurethanes.

Examples of stabilizing agents which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include monocrystalline waxes and more particularly ozokerite,inorganic salts, such as sodium chloride or magnesium chloride, orsilicone polymers, such as polysiloxane polyalkyl polyether copolymers.

Examples of solvents which can be combined with said self-invertibleinverse latex as defined above in said compositions (F) and (G) includewater, organic solvents, such as glycerol, diglycerol, glycerololigomers, ethylene glycol, propylene glycol, butylene glycol,1,3-propanediol, 1,2-propanediol, hexylene glycol, diethylene glycol,xylitol, erythritol, sorbitol, water-soluble alcohols, such as ethanol,isopropanol or butanol, or mixtures of water and of said organicsolvents.

Examples of thermal or mineral waters which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include thermal or mineral waters having a mineralization of atleast 300 mg/l, in particular Avene water, Vittel water, Vichy basinwater, Uriage water, La Roche-Posay water, La Bourboule water,Enghien-les-Bains water, Saint-Gervais-les-Bains water, Néris-les-Bainswater, Allevard-les-Bains water, Digne water, Maizières water,Neyrac-les-Bains water, Lons-les-Saunier water, Rochefort water, SaintChristau water, Les Fumades water and Tercis-les-Bains water.

Examples of hydrotropic agents which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include xylenesulfonates, cumenesulfonates, hexyl polyglucoside,2-ethylhexyl polyglucoside and n-heptyl polyglucoside.

Examples of emulsifying surface-active agents which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include non-ionic surfactants, anionic surfactants orcationic surfactants.

Examples of emulsifying nonionic surfactants which can be combined withsaid self-invertible inverse latex as defined above in said compositions(F) and (G) include esters of fatty acids and of sorbitol, such as theproducts sold under the names Montane™ 40, Montane™ 60, Montane™ 70,Montane™ 80 and Montane™ 85; compositions comprising glycerol stearateand stearic acid ethoxylated with between 5 mol and 150 mol of ethyleneoxide, such as the composition comprising stearic acid ethoxylated with135 mol of ethylene oxide and glycerol stearate sold under the nameSimulsol™ 165; mannitan esters; ethoxylated mannitan esters; sucroseesters; methyl glucoside esters; alkyl polyglycosides including a linearor branched and saturated or unsaturated aliphatic radical andcomprising from 14 to 36 carbon atoms, such as tetradecyl polyglucoside,hexadecyl polyglucoside, octadecyl polyglucoside, hexadecylpolyxyloside, octadecyl polyxyloside, eicosyl polyglucoside, dodecosylpolyglucoside, 2-octyldodecyl polyxyloside or 12-hydroxystearylpolyglucoside; compositions of linear or branched and saturated orunsaturated fatty alcohols and comprising from 14 to 36 carbon atoms andof alkyl polyglycosides such as described above, for example thecompositions sold under the names Montanov™ 68, Montanov™ 14, Montanov™82, Montanov™ 202, Montanov™ S, Montanov™ WO18, Montanov™ L, Fluidanov™20X and Easynov™.

Examples of anionic surfactants which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include glyceryl stearate citrate, cetearyl sulfate, soaps, suchas sodium stearate or triethanolammonium stearate, and N-acylatedderivatives of amino acids which are salified, for example stearoylglutamate.

Examples of emulsifying cationic surfactants which can be be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) include amine oxides, quaternium-82 and thesurfactants described in the patent application WO 96/00719 and mainlythose, the fatty chain of which comprises at least 16 carbon atoms.

Examples of opacifying and/or pearlescent agents which can be combinedwith said self-invertible inverse latex as defined above in saidcompositions (F) and (G) include sodium palmitate, sodium stearate,sodium hydroxystearate, magnesium palmitate, magnesium stearate,magnesium hydroxystearate, ethylene glycol monostearate, ethylene glycoldistearate, polyethylene glycol monostearate, polyethylene glycoldistearate or fatty alcohols comprising from 12 to 22 carbon atoms.

Examples of texturing agents which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include N-acylated derivatives of amino acids, such as lauroyllysine sold under the name Aminohope™ LL, starch octenylsuccinate soldunder the name Dryflo™, myristyl polyglucoside sold under the nameMontanov™ 14, cellulose fibers, cotton fibers, chitosan fibers, talc,sericite or mica.

Examples of deodorant agents which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include alkali metal silicates, zinc salts, such as zincsulfate, zinc gluconate, zinc chloride or zinc lactate; quaternaryammonium salts, such as cetyltrimethylammonium salts or cetylpyridiniumsalts; glycerol derivatives, such as glycerol caprate, glycerolcaprylate or polyglycerol caprate; 1,2-decanediol; 1,3-propanediol;salicylic acid; sodium bicarbonate; cyclodextrins; metallic zeolites;Triclosan™; aluminum bromohydrate, aluminum chlorohydrates, aluminumchloride, aluminum sulfate, aluminum zirconium chlorohydrates, aluminumzirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate,aluminum zirconium pentachlorohydrate, aluminum zirconiumoctachlorohydrate, aluminum sulfate, sodium aluminum lactate, complexesof aluminum chlorohydrate and of glycol, such as the complex of aluminumchlorohydrate and of propylene glycol, the complex of aluminumdichlorohydrate and of propylene glycol, the complex of aluminumsesquichlorohydrate and of propylene glycol, the complex of aluminumchlorohydrate and of polyethylene glycol, the complex of aluminumdichlorohydrate and of polyethylene glycol, or the complex of aluminumsesquichlorohydrate and of polyethylene glycol.

Examples of oils which can be combined with said self-invertible inverselatex as defined above in said compositions (F) and (G) include mineraloils, such as liquid paraffin, liquid petroleum jelly, isoparaffins orwhite mineral oils; oils of animal origin, such as squalene or squalane;vegetable oils, such as phytosqualane, sweet almond oil, coconut oil,castor oil, jojoba oil, olive oil, rapeseed oil, peanut oil, sunfloweroil, wheat germ oil, corn germ oil, soybean oil, cottonseed oil, alfalfaoil, poppy oil, pumpkinseed oil, evening primrose oil, millet oil,barley oil, rye oil, safflower oil, candlenut oil, passionflower oil,hazelnut oil, palm oil, shea butter, apricot kernel oil, calophyllumoil, sisymbrium oil, avocado oil, calendula oil, oils resulting fromflowers or vegetables or ethoxylated vegetable oils; synthetic oils,such as fatty acid esters, for example butyl myristate, propylmyristate, isopropyl myristate, cetyl myristate, isopropyl palmitate,octyl palmitate, butyl stearate, hexadecyl stearate, isopropyl stearate,octyl stearate, isocetyl stearate, dodecyl oleate, hexyl laurate,propylene glycol dicaprylate, esters derived from lanolic acid, such asisopropyl lanolate or isocetyl lanolate, fatty acid monoglycerides,diglycerides and triglycerides, such as glycerol triheptanoate,alkylbenzoates, hydrogenated oils, poly(α-olefins), polyolefins, such aspoly(isobutane), synthetic isoalkanes, such as isohexadecane orisododecane, or perfluorinated oils; silicone oils, such asdimethylpolysiloxanes, methylphenylpolysiloxanes, silicones modified byamines, silicones modified by fatty acids, silicones modified byalcohols, silicones modified by alcohols and fatty acids, siliconesmodified by polyether groups, epoxy-modified silicones, siliconesmodified by fluorinated groups, cyclic silicones and silicones modifiedby alkyl groups. In the present patent application, “oils” is understoodto mean compounds and/or mixtures of compounds which are insoluble inwater, existing under a liquid appearance at a temperature of 25° C.

Examples of waxes which can be combined with said self-invertibleinverse latex as defined above in said compositions (F) and (G) includebeeswax, carnauba wax, candelilla wax, ouricury wax, Japan wax, corkfiber wax, sugarcane wax, paraffin waxes, lignite waxes,microcrystalline waxes, lanolin wax; ozokerite; polyethylene wax;silicone waxes; vegetable waxes; fatty alcohols and fatty acids whichare solid at ambient temperature, or glycerides which are solid atambient temperature. In the present patent application, “waxes” isunderstood to mean compounds and/or mixtures of compounds which areinsoluble in water, existing under a solid appearance at a temperatureof greater than or equal to 45° C.

Examples of active principles which can be combined with saidself-invertible inverse latex as defined above in said compositions (F)and (G) include vitamins and their derivatives, in particular theiresters, such as retinol (vitamin A) and its esters (for example retinylpalmitate), ascorbic acid (vitamin C) and its esters, sugar derivativesof ascorbic acid (such as ascorbyl glucoside), tocopherol (vitamin E)and its esters (such as tocopheryl acetate), vitamin B3 or B10(niacinamide and its derivatives); compounds showing a lightening ordepigmenting action on the skin, such as ω-undecylenoyl phenylalaninesold under the name Sepiwhite™ MSH, Sepicalm™ VG, the glycerol monoesterand/or the glycerol diester of ω-undecylenoyl phenylalanine,ω-undecylenoyl dipeptides, arbutin, kojic acid, hydroquinone; compoundsshowing a soothing action, in particular Sepicalm™ S, allantoin andbisabolol; antiinflammatory agents; compounds showing moisturizingaction, such as urea, hydroxyureas, glycerol, polyglycerols, glycerolglucoside, diglycerol glucoside, polyglyceryl glucosides, xylitylglucoside; polyphenol-rich plant extracts, such as grape extracts, pineextracts, wine extracts or olive extracts; compounds showing a slimmingor lipolytic action, such as caffeine or its derivatives, Adiposlim™,Adipoless™, fucoxanthin; N-acylated proteins; N-acylated peptides, suchas Matrixyl™; N-acylated amino acids; partial hydrolyzates of N-acylatedproteins; amino acids; peptides; total hydrolyzates of proteins; soybeanextracts, for example Raffermine™; wheat extracts, for example Tensine™or Gliadine™; plant extracts, such as tannin-rich plant extracts,isoflavone-rich plant extracts or terpene-rich plant extracts; extractsof freshwater or marine algae; marine plant extracts; marine extracts ingeneral, such as corals; essential waxes; bacterial extracts; ceramides;phospholipids; compounds showing an antimicrobial action or a purifyingaction, such as Lipacide™ CBG, Lipacide™ UG, Sepicontrol™ A5; Octopirox™or Sensiva™ SC50; compounds showing an energizing or stimulatingproperty, such as Physiogenyl™, panthenol and its derivatives, such asSepicap™ MP; antiaging active principles, such as Sepilift™ DPHP,Lipacide™ PVB, Sepivinol™, Sepivital™, Manoliva™, Phyto-Age™, Timecode™;Survicode™; antiphotoaging active principles; active principles whichprotect the integrity of the dermoepidermal junction; active principleswhich increase the synthesis of the components of the extracellularmatrix, such as collagen, elastins or glycosaminoglycans; activeprinciples which act favorably on chemical cell communication, such ascytokines, or physical cell communication, such as integrins; activeprinciples which create a feeling of “heating” on the skin, such asactivators of cutaneous microcirculation (such as nicotinic acidderivatives) or products which create a feeling of “coolness” on theskin (such as menthol and derivatives); active principles which improvecutaneous microcirculation, for example venotonics; draining activeprinciples; active principles having a decongestant purpose, such asGinkgo biloba, ivy, horse chestnut, bamboo, Ruscus, butcher's broom,Centella asiatica, fucus, rosemary or willow extracts; agents fortanning or browning the skin, for example dihydroxyacetone (DHA),erythrulose, mesotartaric aldehyde, glutaraldehyde, glyceraldehyde,alloxan or ninhydrin, plant extracts, for example extracts of red woodsof the genus Pterocarpus and of the genus Baphia, such as Pteropcarpussantalinus, Pterocarpus osun, Pterocarpus soyauxii, Pterocarpuserinaceus, Pterocarpus indicus or Baphia nitida, such as those describedin the European patent application EP 0 971 683; agents known for theiraction in facilitating and/or accelerating tanning and/or browning ofhuman skin, and/or for their action in coloring human skin, for examplecarotenoids (and more particularly β-carotene and γ-carotene), theproduct sold under the brand name Carrot Oil (INCI name: Daucus carota,Helianthus annuus sunflower oil) by Provital, which containscarotenoids, vitamin E and vitamin K; tyrosine and/or its derivatives,known for their effect on the acceleration of the tanning of human skinin combination with exposure to ultraviolet radiation, for example theproduct sold under the brand name “SunTan Accelerator™” by Provital,which contains tyrosine and riboflavins (vitamin B), the tyrosine andtyrosinase complex sold under the brand name “Zymo Tan Complex” by ZymoLine, the product sold under the band name MelanoBronze™ (INCI name:Acetyl Tyrosine, Monk's pepper extract (Vitex agnus-castus)) by Mibelle,which contains acetyl tyrosine, the product sold under the brand nameUnipertan VEG-24/242/2002 (INCI name: butylene glycol and acetyltyrosine and hydrolyzed vegetable protein and adenosine triphosphate) byUnipex, the product sold under the brand name “Try-Excell™” (INCI name:Oleoyl Tyrosine and Luffa Cylindrica (Seed Oil and Oleic Acid) bySederma, which contains extracts of marrow seed (or loofah oil), theproduct sold under the brand name “Actibronze™” (INCI name: hydrolyzedwheat protein and acetyl tyrosine and copper gluconate) by Alban Muller,the product sold under the brand name Tyrostan™ (INCI name: potassiumcaproyl tyrosine) by Synerga, the product sold under the brand nameTyrosinol (INCI name: sorbitan isostearate, glyceryl oleate, caproyltyrosine) by Synerga, the product sold under the brand name InstaBronze™(INCI name: dihydroxyacetone and acetyl tyrosine and copper gluconate)by Alban Muller, the product sold under the brand name Tyrosilane (INCIname: methylsilanol and acetyl tyrosine) by Exymol; peptides known fortheir melanogenesis-activating effect, for example the product soldunder the brand name Bronzing SF Peptide powder (INCI name: Dextran andOctapeptide-5) by Infinitec Activos, the product sold under the brandname Melitane (INCI name: Glycerin and Aqua and Dextran and AcetylHexapeptide-1) comprising acetyl hexapeptide-1 known for its α-MSHagonist action, the product sold under the brand name MelatimesSolutions™ (INCI name: Butylene Glycol, Palmitoyl Tripeptide-40) byLipotec, sugars and sugar derivatives, for example the product soldunder the brand name Tanositol™ (INCI name: inositol) by Provital, theproduct sold under the brand name Thalitan™ (or Phycosaccharide™ AG) byCODIF International (INCI name: aqua and hydrolyzed algin (Laminariadigitata) and magnesium sulfate and manganese sulfate) containing anoligosaccharide of marine origin (guluronic acid and mannuronic acidwhich are chelated with magnesium and manganese ions), the product soldunder the brand name Melactiva™ (INCI name: Maltodextrin, MucunaPruriens Seed Extract) by Alban Muller, flavonoid-rich compounds, forexample the product sold under the brand name “Biotanning” (INCI name:Hydrolyzed citrus Aurantium dulcis fruit extract) by Silab and known tobe rich in lemon flavonoids (of the hesperidin type); agents intendedfor the treatment of head hair and/or body hair, for example agentswhich protect the melanocytes of the hair follicle, which are intendedto protect said melanocytes against cytotoxic agents responsible for thesenescence and/or the apoptosis of said melanocytes, such as mimetics ofthe activity of DOPAchrome tautomerase chosen from those described inthe European patent application published under the number EP 1 515 688A2, synthetic molecules which mimic SOD, for example manganesecomplexes, antioxidant compounds, for example cyclodextrin derivatives,silica-containing compounds derived from ascorbic acid, lysinepyrrolidonecarboxylate or arginine pyrrolidonecarboxylate, combinationsof mono- and diester of cinnamic acid and of vitamin C, and moregenerally those mentioned in the European patent application publishedunder the number EP 1 515 688 A2.

Examples of antioxidants which can be combined with said self-invertibleinverse latex as defined above in said compositions (F) and (G) includeEDTA and its salts, citric acid, tartaric acid, oxalic acid, BHA(butylhydroxyanisole), BHT (butylhydroxytoluene), tocopherolderivatives, such as tocopheryl acetate, mixtures of antioxidantcompounds, such as Dissolvine GL 47S sold by AkzoNobel under the INCIname: Tetrasodium Glutamate Diacetate.

Examples of sunscreens which can be combined with said self-invertibleinverse latex as defined above in said compositions (F) and (G) includeall those appearing in the amended Cosmetics Directive 76/768/EEC, AnnexVII.

The organic sunscreens which can be combined with said self-invertibleinverse latex as defined above in said compositions (F) and (G) includethe family of the benzoic acid derivatives, such as para-aminobenzoicacids (PABA), in particular monoglycerol esters of PABA, ethyl esters ofN,N25 propoxy PABA, ethyl esters of N,N-diethoxy PABA, ethyl esters ofN,N-dimethyl PABA, methyl esters of N,N-dimethyl PABA or butyl esters ofN,N-dimethyl PABA; the family of the anthranilic acid derivatives, suchas homomenthyl N-acetylanthranilate; the family of the salicylic acidderivatives, such as amyl salicylate, homomenthyl salicylate, ethylhexylsalicylate, phenyl salicylate, benzyl salicylate or p-isopropylphenylsalicylate; the family of the cinnamic acid derivatives, such asethylhexyl cinnamate, ethyl 4-isopropylcinnamate, methyl2,5-diisopropylcinnamate, propyl p-methoxycinnamate, isopropylp-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate(2-ethylhexyl p-methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate,cyclohexyl p-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate,2-ethylhexyl α-cyano-β-phenylcinnamate or mono(2-ethylhexanoyl)glyceryldi(para-methoxycinnamate); the family of the benzophenone derivatives,such as 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone,2,2′,4,4′-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone,2-hydroxy-4-methoxy-4′-methylbenzophenone,2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone,2-ethylhexyl 4′-phenylbenzophenone-2,5-dicarboxylate,2-hydroxy-4-(n-octyloxy)benzophenone, 4-hydroxy-3-carboxybenzophenone;3-(4′-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, camphorbenzalkonium methosulfate; urocanic acid, ethyl urocanate; the family ofthe sulfonic acid derivatives, such as 2-phenylbenzimidazole-5-sulfonicacid and its salts; the family of the triazine derivatives, such ashydroxyphenyl triazine,ethylhexyloxyhydroxyphenyl-4-methoxyphenyltriazine,2,4,6-trianilino(p-carbo-2′-ethylhexyl-1′-oxy)-1,3,5-triazine, the4,4-((6-(((1,1-dimethylethyl)amino)carbonyl)phenyl)amino)-1,3,5-triazine-2,4-diyldiimino) bis-(2-ethylhexyl) ester of benzoic acid,2-phenyl-5-methylbenzoxazole, 2,2′-hydroxy-5-methylphenylbenzotriazole,2-(2′-hydroxy-5′-(t-octyl)phenyl)benzotriazole,2-(2′-hydroxy-5′-methyphenyl)benzotriazole; dibenzalazine;dianisoylmethane, 4-methoxy-4″-t-butylbenzoylmethane;5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one; the family of thediphenylacrylate derivatives, such as 2-ethylhexyl2-cyano-3,3-diphenyl-2-propenoate or ethyl2-cyano-3,3-diphenyl-2-propenoate; or the family of the polysiloxanes,such as benzylidene siloxane malonate.

The inorganic sunscreens, also known as “inorganic filters”, which canbe combined with said self-invertible inverse latex as defined above insaid compositions (F) and (G) include titanium oxides, zinc oxides,cerium oxide, zirconium oxide, yellow, red or black iron oxides, orchromium oxides. These inorganic filters may or may not be micronized,may or may not have been subjected to surface treatments and mayoptionally be presented in the form of aqueous or oily predispersions.

Finally, a subject matter of the invention is the use of saidcomposition (C_(e)), as defined above, as inverting agent of an inverselatex of a crosslinked anionic polyelectrolyte (P) comprising, per 100mol %:

(a₁)—of a proportion of greater than or equal to 30 mol % and less thanor equal to 100 mol % of monomer units resulting from2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid in free acidor partially or totally salified form;

(a₂)—optionally of a proportion of greater than 0 mol % and less than orequal to 70 mol % of monomer units resulting from at least one monomerchosen from the elements of the group consisting of acrylic acid,methacrylic acid, 2-(carboxyethyl)acrylic acid, itaconic acid, maleicacid and 3-methyl-3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylfunctional group of said monomers being in the free acid, partiallysalified or completely salified form, and/or from the elements of thegroup consisting of 2-hydroxyethyl acrylate, 2,3-dihydroxypropylacrylate, 2-hydroxyethyl methacrylate, 2,3-dihydroxypropyl methacrylate,or vinylpyrrolidone;

(a₃)—of a proportion of greater than 0 mol % and less than or equal to 1mol % of monomer units resulting from at least one diethylenic orpolyethylenic crosslinking monomer (AR);

the sum of said molar proportions of monomer units according to a₁), a₂)and a₃) being equal to 100 mol %;

-   said inverse latex being an emulsion of water-in-oil type (W)    comprising, per 100% of its weight:

a)—from 10% by weight to 90% by weight of said crosslinked anionicpolyelectrolyte (P);

b)—from 5% by weight to 50% by weight of a fatty phase constituted of atleast one oil (O);

c)—from 1% by weight to 50% by weight of water; and

d)—from 0.5% by weight to 10% by weight of an emulsifying system ofwater-in-oil type (S₁);

the sum of the proportions by weight of compounds according to a), b),c) and d) being equal to 100% by weight.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following examples illustrate the invention without, however,limiting it.

I—Preparation of Surface-Active Compositions According to the Inventionand Comparative Compositions I_(A)—Preparation of a CompositionComprising Glyceryl Polyglucoside and Glycerol

650 grams of glycerol, i.e. 5 molar equivalents, are introduced into ajacketed glass reactor provided with efficient stirring, in which jacketa heat-exchange fluid circulates. The glycerol is brought to atemperature of approximately 100° C.

423.9 grams, i.e. 1 molar equivalent, of glucose are then graduallyadded to the reaction medium in order to allow it to homogeneouslydisperse. An acidic catalytic system consisting of 0.51 gram of 98%sulfuric acid is added to the mixture thus obtained.

The reaction medium is placed under a partial vacuum at 30 mbars, andmaintained at a temperature of 100° C.-105° C. for a period of time offour hours, with evacuation of the water formed by means of adistillation assembly.

The reaction medium is subsequently cooled to 95° C.-100° C. andneutralized by addition of 30% sodium hydroxide, in order to bring thepH of a 1% solution of this mixture to a value of approximately 7.0.

The reaction mixture is emptied in order to obtain the compositionreferenced (E_(IB)).

The analytical characteristics of the composition (E_(IB)) thus obtainedare as follows:

-   -   Appearance (visual): clear liquid;    -   pH 1% solution: 6.8;    -   Residual glycerol: 55.1%;    -   Residual glucose: <1%;    -   Glyceryl polyglucosides: 44.7%

I_(B)—Preparation of the Composition (EM₂) Based on Decaglycerol Laurate(EM₁) and on Hexaglycerol

71.5 grams of decaglycerol monolaurate sold under the brand nameDecaglyn 1-L (hereinafter denoted by the term “Composition (EM₁)”) and28.5 grams of polyglycerol-6 (sold under the brand name Polyglycerol 6™by Spiga) are introduced into a jacketed glass reactor provided withefficient mechanical stirring, in which jacket a heat-exchange fluidcirculates, at a temperature of 35° C. under mechanical stirring ofanchor type at a speed of 80 revolutions/minute. After mixing under suchconditions for 30 minutes, the mixture is emptied in order to obtain thecomposition (EM₂).

I_(C)—Preparation of the Composition (EM₃) Based on Decaglycerol Laurate(EM₁) and on Decaglycerol

71.5 grams of decaglycerol monolaurate sold under the brand nameDecaglyn 1-L (hereinafter denoted by the term “Composition (EM₁)”) and28.5 grams of polyglycerol-10 (sold under the brand name Polyglycerin10™) are introduced into a jacketed glass reactor provided withefficient mechanical stirring, in which jacket a heat-exchange fluidcirculates, at a temperature of 35° C. under mechanical stirring ofanchor type at a speed of 80 revolutions/minute.

After mixing under such conditions for 30 minutes, the mixture isemptied in order to obtain the composition (EM₃).

I_(D)—Preparation of the Composition (EM₄) Based on Decaglycerol Laurate(EM₁), on Glyceryl Polyglucoside and on Glycerol (E_(IB))

71.5 grams of decaglycerol monolaurate sold under the brand nameDecaglyn 1-L (hereinafter denoted by the term “Composition (EM₁)”) and28.5 grams of the composition (E_(IB)), the preparation of which isdescribed above, are introduced into a jacketed glass reactor providedwith efficient mechanical stirring, in which jacket a heat-exchangefluid circulates, at a temperature of 35° C. under mechanical stirringof anchor type at a speed of 80 revolutions/minute. After mixing undersuch conditions for 30 minutes, the mixture is emptied in order toobtain the composition (EM₄).

I_(E)—Preparation of the Composition (EM₅) Based on Decaglycerol Laurate(EM₁) and on Glycerol

71.5 grams of decaglycerol monolaurate sold under the brand nameDecaglyn 1-L (hereinafter denoted by the term “Composition (EM₁)”) and28.5 grams of glycerol are introduced into a jacketed glass reactorprovided with efficient mechanical stirring, in which jacket aheat-exchange fluid circulates, at a temperature of 35° C. undermechanical stirring of anchor type at a speed of 80 revolutions/minute.After mixing under such conditions for 30 minutes, the mixture isemptied in order to obtain the composition (EM₅).

The analytical characteristics of the compositions (EM₁), (EM₂), (EM₃),(EM₄), (EM₅) and (EM₆) are recorded in table 1 below.

TABLE 1 Proportions of constituents Emulsifying composition (% byweight) (EM₁) (EM₂) (EM₃) (EM₄) (EM₅) Decaglycerol monolaurate 100%71.5% 71.5% 71.5% 71.5% Proportion by weight of  0% 28.5   0%   0%   0%hexaglycerol Proportion by weight of  0%   0% 28.5     0%   0%decaglycerol Proportion by weight of  0%   0%   0% 12.8%   0% glycerylpolyglucoside Proportion by weight of  0%   0%   0% 15.7% 28.5  glycerol

II—Preparation and Evaluation of Self-Invertible Inverse Latexes of aCrosslinked Copolymer of the Sodium Salt of2-methyl-[(1-oxo-2-propenyl)amino]-1-propanesulfonic Acid and ofPartially Salified Acrylic Acid

An aqueous phase is prepared by successively pouring, into a beaker andwith stirring, 75.4 grams of glacial acrylic acid, 577.5 grams of a 55%aqueous solution of sodium salt of2-methyl-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, 42.5 grams ofa 48% by weight aqueous sodium hydroxide solution, 0.45 gram of acommercial 40% by weight aqueous sodium diethylenetriaminepentaacetatesolution and 0.167 gram of methylenebis(acrylamide). The pH of thisaqueous phase is subsequently adjusted to 5.5.

Independently, an organic phase is prepared by mixing 208 grams of themixture of alkanes sold under the brand name Emogreen™ L15, 14 grams ofMontane™ 80, 9.5 grams of Montane™ 70 and 0.2 gram ofazobis(isobutyronitrile) (AIBN).

The aqueous phase prepared is subsequently gradually added to the oilyphase and then dispersed using a rotor-stator of Ultra-Turrax type soldby IKA.

The emulsion obtained is transferred into a reactor in order to besubjected to sparging with nitrogen in order to remove the oxygen andcooled to approximately 5-6° C. 5 cm³ of a 0.42% by weight solution ofcumene hydroperoxide in Emogreen™ L15 are added to the emulsion which iskept stirred, followed by gradual introduction of a 0.1% by weightaqueous sodium metabisulfite solution at a flow rate of 0.5 cm³ perminute, in order to initiate the polymerization reaction. Thetemperature of the medium increases until a stationary phase is reached.The reaction medium is subsequently heated at 85° C. for 1 hour and thenthe combined mixture is cooled down to approximately 35° C. in order toobtain the mixture denoted (M₂).

The mixture (M₂) obtained above is divided up into different portions,to which the different surface-active compositions (EM₁), (EM₂), (EM₃),(EM₄) and (EM₅), as described above, preheated to 60° C., are added inproportions by weight as shown in table 2 below.

The self-invertible inverse latexes resulting from these mixtures arerespectively denoted (IL₁), (IL₂), (IL₃), (IL₄) and (IL₅) and areevaluated by the observation of their appearance at 25° C., by the rateof inversion during the preparation of an aqueous gel comprising 2% byweight of self-invertible inverse latex and by the viscosity of thisaqueous gel comprising 2% by weight of a self-invertible inverse latex.

The method for evaluation of the duration of inversion of theself-invertible inverse latexes consists in introducing, into a 2 literbeaker, the amount of water necessary for the preparation of 800 gramsof an aqueous gel. A mechanical helical stirrer of Turbotest™ type,version 2004, sold by VMI, connected to a motor, is placed toward thebottom of the beaker. Stirring is started at a speed of 900revolutions/minute and the necessary amount of self-invertible inverselatex to be evaluated is introduced into the beaker with stirring. Thisstirring creates a vortex which disappears when the polymer inverts andthe gel is formed. The duration of inversion, measured in seconds, ofthe self-invertible inverse latexes corresponds to the time elapsedbetween the start of the addition of the self-invertible inverse latextested and the disappearance of the vortex, resulting in a smooth gel,devoid of lumps, being obtained. This evaluation is carried out onconclusion of the manufacture of the inverse latexes tested (t=0) andthen after a period of storage at 25° C. of 3 months (t=3 months). Theresults obtained are recorded in table 2 below. The viscosity of anaqueous gel comprising 2% by weight of self-invertible inverse latex (μ)is measured at t=0 and then at t=3 months, by means of a Brookfield RVTviscometer (Spindle 6 Speed 5). Likewise, the appearance of theself-invertible inverse latex is evaluated visually at t=0.

TABLE 2 Self-invertible inverse latexes (IL₁) (IL₂) (IL₃) (IL₄) (IL₅)Reference of the surface-active composition tested (EM₁) (EM₂) (EM₃)(EM₄) (EM₅₎ Amount tested 5% 7% 7% 7% 7% (EM_(i))/(IL_(i)) (% by weight)Measurements at t = 0 μ (in mPa · s) 120 000 116 000 104 000 98 000 104000 Duration of inversion 130 s 38 s 38 s 60 s 16 s Appearance of theLme* Lme* Lme* Lme* Lme* self-invertible latex at 25° C. Measurements att = 3 months (3 M) μ (in mPa · s)  97 000  98 000 100 000 94 000  95 000Duration of inversion 151 s 55 s 78 s 78 s 17 s Lme*: Liquid milkyemulsion

The self-invertible inverse latexes (IL₂), (IL₃), (IL₄) and (IL₅)according to the invention and devoid of alkoxylated derivatives andmore particularly of ethoxylated derivatives make it possible to obtainsmooth gels, with a duration of inversion far lower than that observedfor the self-invertible inverse latex (IL₁), comprising onlydecaglycerol monolaurate alone as constituent of the invertingsurface-active system, while retaining excellent thickening properties.Furthermore, they are characterized by a better reproducibility of therate of inversion and of the thickening properties after storage forthree months than for the comparative self-invertible inverse latex(IL₁).

III—Preparation and Evaluation of Self-Invertible Inverse Latexes of aCrosslinked Copolymer of the Sodium Salt of2-methyl-[(1-oxo-2-propenyl)amino]-1-propanesulfonic Acid and ofPartially Salified Acrylic Acid

Example II, described above, is repeated, the 208 grams of Emogreen™ L15being replaced with 208 grams of isohexadecane, in order to obtain themixture denoted (M₃), which is divided up into different portions, towhich the different surface-active compositions (EM₁), (EM₂) and (EM₃),as described above, preheated to 60° C., are added in proportions byweight as shown in table 3 below. The self-invertible inverse latexesresulting from these mixtures are respectively denoted (IL₆), (IL₇) and(IL₈) and are evaluated by the observation of their appearance at 25°C., by the rate of inversion during the preparation of an aqueous gelcomprising 2% by weight of self-invertible inverse latex (the method ofwhich is described above) and by the viscosity of this aqueous gelcomprising 2% by weight of a self-invertible inverse latex (μ;Brookfield RVT viscometer (Spindle 6 Speed 5)). This evaluation iscarried out on conclusion of the manufacture of the inverse latexestested (t=0) and then after a period of storage at 25° C. of 3 months(t=3 months).

The results obtained are recorded in table 3 below.

TABLE 3 Self-invertible inverse latexes (IL₆) (IL₇) (IL₈) Surface-activecomposition tested (EM₁) (EM₂) (EM₃) Amount tested (EM_(i))/(IL_(i)) 5%7% 7% (% by weight) Measurements at t = 0 μ (in mPa · s) 108 000 106 000110 000 Duration of inversion 125 s 60 s 25 s Appearance of theself-invertible Lme* Lme* Lme* latex at 25° C. Measurements at t = 3months μ (in mPa · s)  97 000 102 000 105 000 Duration of inversion 155s 70 s 72 s Lme*: Liquid milky emulsion

The self-invertible inverse latexes (IL₇) and (IL₈) according to theinvention and devoid of alkoxylated derivatives and more particularly ofethoxylated derivatives make it possible to obtain smooth gels, with aduration of inversion far lower than that observed for theself-invertible inverse latex (IL₆), comprising only decaglycerolmonolaurate alone as constituent of the inverting surface-active system,while retaining excellent thickening properties. Furthermore, they arecharacterized by a better reproducibility of the rate of inversion andof the thickening properties after storage for three months than for thecomparative self-invertible inverse latex (IL₁).

IV: Illustrative Cosmetic Formulations

In the following formulations, the percentages are expressed aspercentage by weight per 100% of the weight of the formulation.

Example IV-1 Care Cream

-   Cyclomethicone: 10%-   Self-invertible inverse latex (IL₂): 0.8%-   Montanov™ 68: 2%-   Stearyl alcohol: 1%-   Stearic alcohol: 0.5%-   Preservative: 0.65%-   Lysine: 0.025%-   EDTA (disodium salt): 0.05%-   Xanthan gum: 0.2%-   Glycerol: 3%-   Water: q.s. for 100%

Example IV-2 Antisun Milk

Formula

-   A Montanov™ 68: 3.0%-   Sesame oil: 5.0%-   Parsol™ MCX: 5.0%-   λ-Carrageenan: 0.10%-   B Water: q.s. for-   C Self-invertible inverse latex (IL₃): 0.80%-   D Fragrance: q.s.-   Preservative: q.s.    Procedure

Emulsify B in A at 60° C., then add C at approximately 60° C., then D atapproximately 30° C. and adjust the pH, if necessary.

Example IV-3 Body Milk

-   Montanov™ 202: 3.5%-   Lanol™ 37T: 8.0%-   Solagum™ L: 0.05%-   Water: q.s. for-   Benzophenone-3: 2.0%-   Dimethicone 350 cPs: 0.05%-   Self-invertible inverse latex (IL₂): 2.5%-   Preservative: 0.2%-   Fragrance: 0.4%

Example IV-4 Makeup-Removing Emulsion Comprising Sweet Almond Oil

-   Montanov™ 202: 5%-   Sweet almond oil: 5%-   Water: q.s. for 100%-   Self-invertible inverse latex (IL₂): 0.3%-   Glycerol: 5%-   Preservative: 0.2%-   Fragrance: 0.3%

Example IV-5 Moisturizing Cream for Greasy Skin

-   Montanov™ 68: 5%-   Cetylstearyl octanoate: 8%-   Octyl palmitate: 2%-   Water: q.s. for 100%-   Self-invertible inverse latex (IL₄): 2.6%-   Micropearl™ M100: 3.0%-   Mucopolysaccharides: 5%-   Sepicide™ HB: 0.8%-   Fragrance: 0.3%

Example IV-6 Makeup-Removing Milk

-   Montanov™ 68: 3%-   Primol™ 352: 8.0%-   Sweet almond oil: 2%-   Water: q.s. for 100%-   Self-invertible inverse latex (IL₂): 0.8%-   Preservative: 0.2%

Example IV-7 Antisun Milk

-   Montanov™ L: 3.5%-   Lanol™ 37T: 10.0%-   Parsol™ MCX: 5.0%-   Eusolex™ 4360: 2.0%-   Water: q.s. for 100%-   Self-invertible inverse latex (IL₂): 1.8%-   Preservative: 0.2%-   Fragrance: 0.4%

Example IV-8 Sunless Tanning Emulsion

-   Lanol™ 99: 15%-   Montanov™ 68: 3.0%-   Parsol™ MCX: 3.0%-   Water: q.s. for 100%-   Dihydroxyacetone: 5.0%-   Monosodium phosphate: 0.2%-   Self-invertible inverse latex (IL₅): 2.5%-   Fragrance: 0.3%-   Sepicide™ HB: 0.8%-   Sodium hydroxide: q.s. pH=5

Example IV-9 Care Cream

-   Cyclomethicone: 10%-   Self-invertible inverse latex (IL₄): 2.8%-   Montanov™ 202: 4.5%-   Preservative: 0.65%-   Lysine: 0.025%-   EDTA (disodium salt): 0.05%-   Xanthan gum: 0.2%-   Glycerol: 3%-   Water: q.s. for 100%

Example IV-10 Antisun Cream

-   Simulsol™ 165: 3%-   Montanov™ 68: 2%-   C12-C15 benzoate: 8%-   Pecosil™ PS 100: 2%-   Dimethicone: 2%-   Cyclomethicone: 5%-   Octyl para-methoxycinnamate: 6%-   Benzophenone-3: 4%-   Titanium oxide: 8%-   Xanthan gum: 0.2%-   Butylene glycol: 5%-   Demineralized water: q.s. for 100%-   Self-invertible inverse latex (IL₂): 1.5%-   Preservative, fragrance: q.s.

Example IV-11 Antisun and Self-Tanning Gel

-   Montanov™ 68: 3.0%-   Glyceryl triheptanoate: 10.0%-   Deepaline™ PVB: 1.05%-   Self-invertible inverse latex (IL₂): 2.2%-   Water: q.s. 100%-   Dihydroxyacetone: 5%-   Fragrance: 0.1%-   Sepicide™ HB: 0.3%-   30 Sepicide™ CI: 0.1%-   Parsol™ MCX: 4.0%

The definitions of the products used in the examples are as follows:

-   Micropearl™ M 100 is an ultrafine powder which is very soft to the    touch and which has a mattifying action, sold by Matsumo.-   Sepicide™ CI, imidazolidinyl urea, is a preservative sold by Seppic.-   Simulsol™ 165 is self-emulsifying glycerol stearate, sold by Seppic.-   Sepicide™ HB, a mixture of phenoxyethanol, methylparaben,    ethylparaben, propylparaben and butylparaben, is a preservative sold    by Seppic.-   Parsol™ MCX is octyl para-methoxycinnamate, sold by Givaudan.-   Lanol™ 37T is glycerol triheptanoate, sold by Seppic.-   Solagum™ L is a carrageenan, sold by Seppic.-   Eusolex™ 4360 is a sunscreen, sold by Merck.-   Deepaline™ PVB is an acylated wheat protein hydrolyzate, sold by    Seppic.-   Primol™ 352 is a mineral oil, sold by Exxon.-   Pecosil™ PS 100 is Dimethicone PEG-7, sold by Phoenix.-   Montanov™ 68 (INCI name: cetearyl alcohol (and) cetearyl glucoside)    is an emulsifying agent, sold by Seppic.-   Montanov™ L (INCI name: C14-22 alcohols (and) C12-20 alkyl    glucoside) is an emulsifying agent, sold by Seppic.-   Montanov™ 202 (INCI name: arachidyl alcohol & behenyl alcohol &    arachidyl) is an emulsifying agent, sold by Seppic.

The invention claimed is:
 1. A self-invertible inverse latex of acrosslinked anionic polyelectrolyte (P) comprising, per 100 mol %:(a₁)—of a proportion of greater than or equal to 30 mol % and less than100 mol % of monomer units resulting from2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid in free acidor partially or totally salified form; (a₂)—of a proportion of greaterthan 0 mol % and less than or equal to 70 mol % of monomer unitsresulting from at least one monomer chosen from the elements of thegroup consisting of acrylic acid, methacrylic acid,2-(carboxyethyl)acrylic acid, itaconic acid, maleic acid and3-methyl-3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylfunctional group of said monomers being in the free acid, partiallysalified or completely salified form, and/or from the elements of thegroup consisting of 2-hydroxyethyl acrylate, 2,3-dihydroxypropylacrylate, 2-hydroxyethyl methacrylate, 2,3-dihydroxypropyl methacrylate,or vinylpyrrolidone; (a₃)—of a proportion of greater than 0 mol % andless than or equal to 1 mol % of monomer units resulting from at leastone diethylenic or polyethylenic crosslinking monomer (AR); the sum ofsaid molar proportions of monomer units according to a₁), a₂) and a₃)being equal to 100 mol %; said self-invertible inverse latex being anemulsion of water-in-oil (W) comprising, per 100% of its weight: a)—from10% by weight to 90% by weight of said crosslinked anionicpolyelectrolyte (P); b)—from 5% by weight to 50% by weight of a fattyphase constituted of at least one oil (O); c)—from 1% by weight to 50%by weight of water; d)—from 0.5% by weight to 10% by weight of anemulsifying system of water-in-oil (S₁); and e)—from 2% by weight to 10%by weight of an emulsifying system of oil-in-water (S₂); the sum of theproportions by weight of a), b), c), d) and e) being equal to 100% byweight; wherein said emulsifying system of oil-in-water (S₂) comprises,per 100% of its weight: f)—a proportion of greater than or equal to 50%by weight and less than or equal to 100% of a composition (C_(e)) whichcomprises, per 100% of its weight; e₁)—from 5% by weight to 15% byweight of at least one compound of formula (I):HO—[CH₂—CH(OH)—CH₂—O]_(n)—H  (I) in which n represents an integergreater than or equal to 1 and less than or equal to 15; e₂)—from 60% byweight to 80% by weight of at least one compound of formula (II):R₁—(C═O)—[O—CH₂—CH(OH)—CH₂]_(p)—OH  (II), in which p, which is differentfrom or identical to n, represents an integer greater than or equal to 1and less than or equal to 15; and in which the R₁—(C═O)— grouprepresents a saturated or unsaturated and linear or branched aliphaticradical comprising from 6 to 22 carbon atoms; and e₃)—from 5% to 15% byweight of at least one composition (C₁₁) represented by the formula(III):HO—[CH₂—CHOH—CH₂—O-]_(q)-(G)_(r)-H  (III), in which q, which isdifferent from or identical to n, represents an integer greater than orequal to 1 and less than or equal to 3, G represents the residue of areducing sugar and r represents a decimal number greater than or equalto 1.05 and less than or equal to 5.00; said composition (C₁₁)consisting of a mixture of the compounds of formulae (III₁), (III₂),(III₃), (III₄) and (III₅):HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₁-H  (III₁),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₂-H  (III₂),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₃-H  (III₃),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₄-H  (III₄),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₅-H  (III₅), in molar proportions of saidcompounds of formulae (III₁), (III₂), (III₃), (III₄) and (III₅)respectively equal to a₁, a₂, a₃, a₄ and a₅, such that the sum(a₁+a₂+a₃+a₄+a₅) is equal to 1, and that the sum (a₁+2a₂+3a₃+4a₄+5a₅) isequal to r; the sum of the proportions by weight of e₁), e₂) and e₃)being equal to 100% by weight.
 2. The self-invertible inverse latex asdefined in claim 1, wherein said crosslinked anionic polyelectrolyte (P)is a a copolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid and ofacrylic acid which are partially or completely salified in the sodiumsalt or ammonium salt form, crosslinked by triallylamine and/ormethylenebis(acrylamide); a copolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid (γ)partially or completely salified in the sodium salt form and of acrylicacid (δ) partially or completely salified in the sodium salt form in amolar ratio (γ)/(δ) of greater than or equal to 30/70 and less than orequal to 90/10, crosslinked by triallylamine and/ormethylenebis(acrylamide); or a copolymer of2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid (γ)partially or completely salified in the sodium salt form and of acrylicacid (δ) partially or completely salified in the sodium salt form in amolar ratio (γ)/(δ) of greater than or equal to 40/60 and less than orequal to 90/10, crosslinked by triallylamine and/ormethylenebis(acrylamide).
 3. The self-invertible inverse latex asdefined in either claim 1, wherein, in the formula (I) as defined above,n represents an integer greater than or equal to 1 and less than orequal to 10, and wherein, in the formula (II) as defined above, p, whichis identical to or different from n, represents an integer greater thanor equal to 1 and less than or equal to 10, and the R₁—(C═O)— group ischosen from octanoyl, decanoyl, W-undecylenoyl, dodecanoyl,tetradecanoyl, hexadecanoyl, octadecanoyl, 9-octadecenoyl or9,12-octadecadienoyl radicals.
 4. The self-invertible inverse latex asdefined in claim 1, wherein, in said emulsifying system of oil-in-water(S₂), said composition (C_(e)) as defined above consists of, per 100% ofits weight: e₁)—from 5% by weight to 15% by weight of at least onecompound of formula (I): as defined above; e₂)—from 60% by weight to 80%by weight of at least one compound of formula (II) as defined above; ande₃)—from 5% to 15% by weight of at least one composition (C₁₁)represented by the formula (III):HO—[CH₂—CHOH—CH₂—O-]_(q)-(G)_(r)-H  (III), in which q, which isdifferent from or identical to n, represents an integer greater than orequal to 1 and less than or equal to 3, G represents the residue of areducing sugar and r represents a decimal number greater than or equalto 1.05 and less than or equal to 5.00; said composition (C₁₁)consisting of a mixture of the compounds of formulae (III₁), (III₂),(III₃), (III₄) and (III₅):HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₁-H  (III₁),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₂-H  (III₂),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₃-H  (III₃),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₄-H  (III₄),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₅-H  (III₅), in molar proportions of saidcompounds of formulae (III₁), (III₂), (III₃), (III₄) and (III₅)respectively equal to a₁, a₂, a₃, a₄ and a₅, such that the sum(a₁+a₂+a₃+a₄+a₅) is equal to 1, and that the sum (a₁+2a₂+3a₃+4a₄+5a₅) isequal to r; the sum of the proportions by weight of e₁), e₂) and e₃)being equal to 100% by weight.
 5. The self-invertible inverse latex asdefined in claim 1, wherein, in the formula (III) as defined above, q isequal to 1, G represents the residue of glucose and r represents adecimal number greater than or equal to 1.05 and less than or equal to2.5.
 6. The self-invertible inverse latex as defined in claim 2,wherein, in the formula (I) as defined above, n represents an integergreater than or equal to 1 and less than or equal to 10, and wherein, inthe formula (II) as defined above, p, which is identical to or differentfrom n, represents an integer greater than or equal to 1 and less thanor equal to 10, and the R1-(C═O)—group is chosen from octanoyl,decanoyl, ω-undecylenoyl, dodecanoyl, tetradecanoyl, hexadecanoyl,octadecanoyl, 9-octadecenoyl or 9,12-octadecadienoyl radicals.
 7. Aself-invertible inverse latex of a crosslinked anionic polyelectrolyte(P) comprising, per 100 mol %: (a₁)—of a proportion of greater than orequal to 30 mol % and less than 100 mol % of monomer units resultingfrom 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid in freeacid or partially or totally salified form; and (a₂)—of a proportion ofgreater than 0 mol % and less than or equal to 1 mol % of monomer unitsresulting from at least one diethylenic or polyethylenic crosslinkingmonomer (AR); the sum of said molar proportions of monomer unitsaccording to a₁) and a₂) being equal to 100 mol %; said self-invertibleinverse latex being an emulsion of water-in-oil (W) comprising, per 100%of its weight: a)—from 10% by weight to 90% by weight of saidcrosslinked anionic polyelectrolyte (P); b)—from 5% by weight to 50% byweight of a fatty phase constituted of at least one oil (O); c)—from 1%by weight to 50% by weight of water; d)—from 0.5% by weight to 10% byweight of an emulsifying system of water-in-oil (S₁); and e)—from 2% byweight to 10% by weight of an emulsifying system of oil-in-water (S₂);the sum of the proportions by weight of a), b), c), d) and e) beingequal to 100% by weight; wherein said emulsifying system of oil-in-water(S₂) comprises, per 100% of its weight: f)—a proportion of greater thanor equal to 50% by weight and less than or equal to 100% of acomposition (C_(e)) which comprises, per 100% of its weight; e₁)—from 5%by weight to 15% by weight of at least one compound of formula (I):HO—[CH₂—CH(OH)—CH₂—O]_(n)—H  (I) in which n represents an integergreater than or equal to 1 and less than or equal to 15; and e₂)—from60% by weight to 80% by weight of at least one compound of formula (II):R₁—(C═O)—[O—CH₂—CH(OH)—CH₂]_(p)—OH  (II), in which p, which is differentfrom or identical to n, represents an integer greater than or equal to 1and less than or equal to 15; and in which the R₁—(C═O)— grouprepresents a saturated or unsaturated and linear or branched aliphaticradical comprising from 6 to 22 carbon atoms; and e₃)—from 5% to 15% byweight of at least one composition (C₁₁) represented by the formula(III):HO—[CH₂—CHOH—CH₂—O-]_(q)-(G)_(r)-H  (III), in which formula (III) q,which is different from or identical to n, represents an integer greaterthan or equal to 1 and less than or equal to 3, G represents the residueof a reducing sugar and r represents a decimal number greater than orequal to 1.05 and less than or equal to 5.00, said composition (C₁₁)consisting of a mixture of the compounds of formulae (III₁), (III₂),(III₃), (III₄) and (III₅):HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₁-H(III₁),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₂-H(III₂),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₃-H(III₃),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₄-H(III₄),HO—[CH₂—CHOH—CH₂—O—]_(q)—O-(G)₅-H(III₅), in molar proportions of saidcompounds of formulae (III₁), (III₂), (III₃), (III₄) and (III₅)respectively equal to a₁, a₂, a₃, a₄ and a₅, such that the suma₁+a₂+a₃+a₄+a₅ is equal to 1, and that the sum a₁+2a₂+3a₃+4a₄+5a₅ isequal to r; the sum of the proportions by weight of e₁), e₂) and e₃)being equal to 100% by weight.
 8. A thickening and/or emulsifying and/orstabilizing agent for a topical cosmetic composition, comprising saidself-invertible inverse latex as defined in claim
 1. 9. A topicalcosmetic composition (F), comprising, as thickening agent, per 100% ofits total weight, between 0.1% and 10% by weight of said self-invertibleinverse latex as defined in claim
 1. 10. A topical pharmaceuticalcomposition (G), comprising, as thickening agent, per 100% of its totalweight, between 0.1% and 10% by weight of said self-invertible inverselatex as defined in claim 1.